基于多体理论的直驱转台精度分析优化

Accuracy Analysis and Optimization of Direct-drive Rotary Table Based on the Theory of Multi-body System

为了提高数控直驱回转台的整体精度,同时合理控制成本。基于多体系统理论,结合该回转工作台的结构和运动特点,建立其空间误差模型;并在此基础上提出一种兼顾精度和成本的综合优化方法,可针对不同需求实现优化。结果表明,该数控直驱回转工作台无论在整体精度还是制造成本方面均有较大改善空间:重视提高精度的优化方案与传统的经验设计值相比,在x/y/z轴方向上使回转工作台的精度分别提高40%、39.99%和25%;重视控制成本的优化方案与传统的经验设计值相比使成本降低33.14%。这两种综合优化方案均使该回转工作台的性能和经济性得到了很好地协调。

To improve the overall accuracy and reduce cost of direct-drive rotary table, the geometric er- rors model was built based on the multi-body system theory and its structure and movement characters. Then an integrated optimal method aiming at accuracy and cost was proposed to meet different needs. The results show that both the overall accuracy and the manufacturing cost have improved greatly. Com- pared with the experience design, the optimization focus on improving accuracy has helped to respective- ly increase the overall accuracy in x/y/z axis by 40% , 39.99% and 25% ; the optimization focus on controlling cost can effectively reduce the cost by 33. 14%. Machine performance and economy are well- coordinated using the two integrated optimization.